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The obesity epidemic is a double whammy for Mexican children, who can be both malnourished and overweight.

"They are exposed to high-fat, high-sugar, high-salt, energy-dense ... foods, which tend to be lower in cost but also lower in nutrient quality," the World Health Organization reports.

It's a growing problem -- and not just for Mexico. Since 1980, obesity rates worldwide have doubled.

In 2008, more than 1.4 billion adults were overweight and 500 million were obese.

The solution is simple but not always easy to accomplish, especially as nutritional options are limited in many parts of the world.

The WHO recommends:

-- Limiting your intake of fats and sugars-- Increasing consumption of fruit and vegetables, as well as legumes, whole grains and nuts-- Engaging in regular physical activity: 60 minutes a day for children and 150 minutes per week for adults